Steam-boiler.



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No. '728,591- Y PATENTED MAY 19, 1903.. W. C. LOGKWOOD.

STEAM BOILER.

APPLIUATION FILED JUNE 2a. 1902. no MODEL. 2 sHBBTssHBsT 2.

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UNITED STATES'4 Patented May 19, 1903.

PATENT OFFICE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 728,591, dated May 19, 1903.

Application filed June 28,1902.

YImprovements in Steam-Boilers, (for Which I have led an application for British patent, No. 8,187, dated April 8, 1902 g) and I do hereby declare the following to be a full, clear, and exact description of the same.

This invention relates to a combined watertube boiler, and is hereinafter described With reference to the accompanying drawings and characterized in the claims.

On the drawings, Figure 1 represents a front elevation; Fig. 2, a sectional elevation; Fig. 8, a sectional side elevation; and Fig. 4, a plan, partly in section.

In the improved boiler a cross-tube-tted water-jacketed fire-box is surrounded at its Vsides and back end by a fine-chamber and vertical-tube auxiliary water-heaters, of which the Water-space is in communication respectively at the bottom and top with the waterspace of the fire-box j acket,and the uespace is in communication with the lire-box interior through tubes crossing the fire-box jacket and?` With an exit-ii ue leading to the chimney, the Water-spaces of the fire-box jacket and of the surrounding auxiliary Water-heaters being, respectively,in communication at their upper parts and also with steam-ducts leading to a steam-receiver common to the series.

The re-box a, fitted with longitudinallyarranged re-bars, (not shoWn,) is jacketed byv a casing b, inclosing a Water-space CZ and a steam-space f, and is crossed by diagonal Wa-V ter-tubes g, which connect different elevations of the Water-space and aid in heating and circulating the Water therein. The Water-space is also crossed at its sides and back end by flue-tubes 71Which lead from different parts of the lire-box through such water-space to different parts of a flue-chamber c'. The chamber 1J surrounds the sides and back end of the jacketed tire-box and alsotheverticaltubes of the auxiliary Water-heaters. At its lower part it is fitted with a Water-chamber'tgwhich communicates by pipes Zwith the Water-space cl, and at its upper part it is tted with a Water-chamber m,which communicates by pipes n with the Water and steam space above the Serial No. 113.661. (No model.)

crown of the lire-box. The chambers 7c m are connected by vertical tubes o, which traverse the depth of the fine-chamber and are expanded into llanged plates p, which are bolted to flanges of the chambers k fm., so as to allow the plates and tubes to be together removed from the chambers. The flue-chamber t' communicates by smoke-holes a with a surrounding flue q, which leads to a chimney. (Not shown.) The steam-spaces fr' of the chambers d m also respectively communicate by pipes s with a steam-receiver t, common to the Whole and which is provided with an end manhole, safety-valves, pressure-gages, and the customary paraphernalia of such apparatus. Thus in the improved combined Water-tube boiler the furnace-gases successively circulate in the fire-box, pass through the surrounding Water-jacket, and circulate in the surrounding Hue-chamber and among the vertical water-tubes therein before escaping to the chimney, While the feed-Water, which is supplied to the chamber k bya pipe c, circulates upwardly mainly through the auxiliary Water-heater pipes and partly to the fire-box jacket, its efficient circulation through both such means of heating it being insured by the relative arrangement and connections of such'parts.

What I claim isl. A water-tube boiler comprising the combination of a Water-jacketed fire-box consisting of inner and outer casings inclosing between them a Water-space, diagonal Watertubes crossing the fire-box and connecting different elevations of the Water-space, linetubes leading laterally from the lire box through the Water-space, a flue-chamber surrounding the Water-jacketed fire-box at its sides and back and communicating with the lfire-box through said flue-tubes, a ilue surcommunicating with and common to all said steam-ducts, as set forth.

IOC

2. In a steam-generator, in combination, a

Avertical tire-box of a long narrow formation having at sides placed relatively near together, a plurality of crossing diagonal Water-tubes leading alternately from its opposite sides to opposite sides of its crown, a vertical water-jacket of a long narrow formation with at sides inclosing the tire-box at its sides and crown, a plurality of nue-tubes connecting the shells of the fire-box and waterjacket at a plurality of levels and adapted to lead the furnace-gases through the side and back parts of the water-j acket to the exterior of the latter, a continuous water-trough made in sectional lengths arranged around the sides and back of the water-jacket at the bottom level of the latter, a plurality of water-tubes connecting the water-jacket and said trough at intervals and adapted to insure circulation of the water at such level, a bed-plate adapted to support such water-trough, an upper chamber substantially duplicate in form to that of said trough made in sectional lengths arranged around thesides and back of the water-jacket at the top level of the latter in inverted opposite relation to the trough, a plurality of vertical Water-tubes arranged in a plurality of rows set in top and bottom tubeplates and adapted to connect said trough and opposite chamber at the sides and back of the Water-jacket so as to inclose and connect the interiors of such trough and chamber while leaving flue-spaces between themselves, a plurality of water and steam tubes connecting said chamber with the upper water and steam space of the water-jacket, a steam-receiver surmounting the water-jacket, a plurality of steam-pipes connecting the steam-spaces of the water-jacket and said chamber at intervals with the steam -receiver by junctions common to both connections, a casing surrounding said side and back sections of vertical water-tubes so as to form -a flue bounded at the bottom and top by said trough and opposite chamber and at the inner sides and back by the waterjacket and adapted to cause the furnace-gases to circulate horizontally around the same and among the vertical tubes and having flue-holes iu its outer sides, and a due surrounding such casing at its front, sides and back at the level ot'v its Hue-holes and adapted to lead the exhausted furnace-gases to a chimney.

In testimony whereof I have signed this specication in the presence of two subscribing witnesses.

WILLIAM GARR LOCKWOOD.

Witnesses:

CHURCH Hows, A. C. TEvIs. 

